Flow sensor for measuring rate of air flow in patient airway

non-metallic attic vents for use in residential and commercial buildings, and parts and fittings therefor

LAMINATED TEXTILES FOR USE IN MAKING WIND RESISTANT GARMENTS

Pharmaceuticals for respiratory therapy

Recovering Heat and Humidity in Ventilation, Heating and Air-Conditioning Systems

Water treatment equipment, namely, sanitizing units for use with chlorine and acid tablets